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ADJUST KE EL
OFFSET
CALIBRAT
—S
E SPEED
—
p
°RESET
flNAR AHDP
fl
MENU
-
PAGE 6
______________________
ADJUST
KEEL OFFSET
The keel offset
feature lets
you ____
_____
compensateforthetransducers
location. Since
this sonar unit
_________
measures the water
depth
from
the face of the
transducer,
there
can be
a significant
difference
______
between the
actual
w:flpth
PAGc
6
MORE
unit. For
example, suppose
you
mount a bolt-thru-hull
transducer on the bottom
of the boat. When
you
launch the boat
you
find
that this location
places
the
transducer three feet
belowthe surface of
thewater.
Therefore,
the
depth.sounderalways
reads
three feet shallower than
the actual water
depth. (In
other
words,
if the
bottom is 50 feet
deep,
the
depth
sounderwill read
47feet,
ifthetransducer
is mourfted three
feet below the
surface.)
The
difference between the
depth
sounder's
reading (47 feet)
and the actual
water
depth (50 feet)
is
called the keel
offset. In this
example
you
will use
a
positive
keel offset.
Another time
you may
wish to
change
the keel offset is if
you
want to know
the bottom
depth
from the
deepest part
of the boat.
Forexample,
by
careful
measurmentyou
find
thatthe
deepest part
of the boat is
fourfeet below the
face of the transducer.
By setting
a
negative
keel offset of four
feet,,
the
sonar unit will show
the bottom
depth
from the
lowest
part
of the boatto the
bottom.
IMPORTANT!
The
digital depth
display
is
the
only
sonarthat is affected
by
the keel offset
feature. The
chart will
always
show the
distance from the face of the
transducer.
To
adjust
the keel
offset,
first
press
the
MENU
key
6
times
while a sonar screen is
dis-
played.
Now
press
the
key
next
to the
"ADJUST KEEL OFF-
SET" label. The screen
shown
below
appears.
The
digital depth
displays
in the
upper
left corner of
the screen.
The keel offset in use
shows in
I
5
naafl
FEET I
2.2.
S
O.O
GETTING STARTED
Initialization
-
Power On
In order
for the UltraNav
II
to lock onto the
satellites,
it must first find them.
If
you
simplytum
the unit on and
wait,
the unit will find the satellites
by
itself
in 15
minutes orless. This
is
called "Cold Start." If
you
let itfindthe
satellites,
the time
display
will
probably
be
wrong,
since it will be
showing
UTC
time
orthe time at
Greenwich,
England.
However,
all other
navigation
displays,
including
the
position display
will
be
correct.
(You
can set the time to
your
local
time.)
To
speed up
the satellite
acquisition
process, you
can initialize
the UltraNav II or "tell it where it is"
the first time it's turned on. This
initialization
process
is
usually
done
only
once and
requires
the
following
The unit
usually only
takes a few minutes or less to find the satellites once
it's been initialized
by
the user.
Afterthe
powercable
and GPS antenna module are
installed, press
the ON
key,
then
press
the GPS
key. Next, press
the MENU
key.
Now
press
the
key
next to the "CHANGE GPS SETTINGS"
label.
Finally, press
the
key
next tG the "SET
LAT, LON, ALT, TIME,
DATE" label. The screen
shown
below
appears
next.
This is the GPS
setup
screen.
The
settings
now in use
are
shown atthe
top
of the
display.
If
you're using
the unit for the
first
time,
these
settings
are
probably
wrong
for
your posi-
tion and time. To
change any
of
the numbers on this
display,
simply pressthe key
nexttothe
arrow with the desired label.
For
example,
to
change
the
local
time,
press
the
key
nextto
the "CHANGE TIME' label.
LATITUDE N 36°08.8E2'
LONGITUDE W 9S0SO.4S4
ALTITUDE 1696
TIME 10:17:23 PM
DATE
1'03'1993
—
LA
-
..
I CHANGE ALT
NETI1
rtEDATE
Note: If
you
don't use the "cold stan'
feature,
then
you
will have to
change
all of the
settings
on this
page
to their
correct values. In other
words,
you
can't
simply
enter
your present position
and have the
unit find the correct
values
by
itself.
data:
1.
Present
position
in
latitude/longitude
2.
Elevation above sea level
(altitude)
3.
Today's
date and time
USE
NUMBERED KEYS TO
ENTER KEEL OFFSET.
USE UP DOWN CURSORS
FOR PLUS
OR MINUS.
30
47
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